Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
19687	Symmetric matrix 2		0	0.00
32065	Save Lord Tachanka	1	0	0.00
35535	Bill of Fare		0	0.00
36644	Minimum string moves	1	0	0.00	34 1
36896	Supraiden		0	0.00
10683	DRIVE		1	1.37
23435	Game Calculator		1	1.75
35287	Magical Matrices	1	1	1.01	17 34
3647	Moebius		2	2.36
9000	Bob and his new kite factory		2	1.14
10443	Bridges		2	2.82
13895	Party Time		2	14.29
21135	Distinct Viewpoints		2	23.08	34 1
22320	Polynomial Drawing		2	9.52
6957	Partial Palindrome		3	5.00
12805	Age of Empires		3	6.41
14665	Delta catheti (hard)	1	3	15.56
14700	Delta catheti II (Hard)	1	3	6.06
15091	One Good Base Deserves Another		3	28.57	34 1
15381	Cut The Rope		3	16.28	42 1
850	Soccer Choreography		4	3.80
2019	The Rolling Ball		4	5.48
2419	G-Line Grid	1	4	3.31
3483	Begin		4	7.94
11384	Zoom Operation		4	16.00
12855	Teleport		4	12.50	17 34
13882	THE WITTY BOY	1	4	4.18	34 17
13945	GHALIBS CHALLENGE		4	15.87
15382	Factorial (Again!)		4	33.33	50 1
17779	Charlie and the Chocolate Factory		4	7.81
25336	Eefun Plays Doto		4	8.74
26183	Laser Beam 2.0	1	4	5.06	17 17
32028	Ada and Parties		4	1.24	50 50
34357	Ludic Numbers (hard)	2	4	14.63
34973	Yet Another Subset Sum Problem	2	4	2.56	26 34
363	Crane Operator		5	2.71
5637	LL and ErBao		5	41.43
15088	Ancient Aliens		5	42.62	34 1
15092	A Kleene Implementation		5	34.04
22675	A conjecture of Paul Erdős (hard)	2	5	5.81	34 34
25450	When Does The World End	1	5	4.27	34 50
26181	Walking Jumper		5	24.24
34315	The Chase		5	8.22
35810	Prismata	1	5	5.71	34 17
42573	Seating Plan	1	5	42.31	17 17
3466	Another Longest Common Subsequence Problem		6	5.66
6230	Dictionary order		6	9.30
7010	Police Business		6	25.00
9086	Formula 3D		6	9.86
12804	Spy	1	6	12.24	50 50